I think the only way to be able to use the theme you downloaded was to have the account of the person you got it from.
So I think you can download them but not use them without the person's account
I've been looking into hacking PSP Games/PSP Themes. I was thinking that if someone could post some premium PSP theme's they've bought or found everyone could put them in their THEME folder and use them. Just an idea, But could it work?
I think the only way to be able to use the theme you downloaded was to have the account of the person you got it from.
So I think you can download them but not use them without the person's account
there's a way to get themes off the internet for PSP's an just put them in the theme folder if their hacked.